Merge pull request #27 from tfausak/gh25-from-id

Add identity `From` instance

src/lib/Witch/Instances.hs

@@ -37,6 +37,9 @@ import qualified Witch.TryFrom as TryFrom
 import qualified Witch.TryFromException as TryFromException
 import qualified Witch.Utility as Utility
 
+instance From.From a a where
+  from = id
+
 -- Int8
 
 -- | Uses 'fromIntegral'.